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Continuous composition monitoring for permanent gases in the first loop in a reactor is of interest in a full study of activation, radiolysis, and state change in the core zone under various operating conditions. It is difficult to determine directly the radioactive and stable isotopes of the individual components in the entire complex mixture, so it is best to combine gas-chromatographic separation with subsequent selective detection. Several types of continuous two-dimensional chromatographs have been used for continuous component isolation. The scope for using these with certain gas mixtures is examined. Model mixtures of argon, krypton, xenon, hydrogen, and oxygen were used in the studies.